R. Fiedler, Ueber Neuerungen im Heizungswesen. In, C. Engler, A. Hollenberg u. H. Kast (Hrsgg.), Dinglers Polytechnisches Journal, 74. Jg., 288. Bd, Heft 4, Stuttgart 28. April 1893, Gotta'schen Buchhandlg, S. 79
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